Compilare: main.cpp: In function 'int main()': main.cpp:55:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | if(xmare!=v.size()) | ~~~~~^~~~~~~~~~ main.cpp:58:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for(int j=xmare;j<v.size();j++) | ~^~~~~~~~~ main.cpp:64:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | if(ymare!=v.size()) | ~~~~~^~~~~~~~~~